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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bff28e4aa9667b863ee8ee37e866db6317731a0ed2715fa88de573184864b45' 
  AND token = 'Z4PvjvnrhDiCC1tRlkg5K3Gjp6lZDk8yIpylTOp64tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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