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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02b15547894fcca7826dcd1567bf0066a02b60cd33c7378e41cdfde8360f439b' 
  AND token = '/WA5YvZkBsxvjL/fgo0Csx4ID+vUTEevr1Ds/noo80Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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