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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5106d483a06267627fdef2f28e377d4e3a607293ae5c5382cc58117b95efb91d' 
  AND token = 'hNmCbu4/tL36tRp6Jnl+cXc+rpk4qh5MAAB5zeefVPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}