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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd31eb7c3eab23c71eff14b393464a760139c8bb6e0aa31a2a18518e93c7b42e' 
  AND token = 'lDrepEGLHoxBbeumRqQqRKR0j75VYYjrdcpenHmzuGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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