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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ecc96d6ba0bcb9286501f3e3447a15c2f9d94fd474d06b47305b5f7190974d8' 
  AND token = '0+I6cNHenL1GRYaINaOCRV9l3o0j1HnJuqCdOJ2FhLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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