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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9aee51ad232500e63cd6e12c3233307bed1435fb36a8fde01819f639eb9863' 
  AND token = 'zBvCabNyQ+fPTLUMTXuNPIQTWxXjv71pIJeIz2o40jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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