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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3015ad00660adc48a4d4426f95f60251d43099b5c008473961ba1fc04ec984' 
  AND token = 'gLVQi6Xb8qHbT112Hwzm4n2x1q+9oyKTpiMXUJ9sLec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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