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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5e0332d0b4cc0009c952f57357e867d6f97b28ffbb503248e28520166d3ebb0' 
  AND token = '69QNVdt45zQWT3Cw8AYToa7umqz6YAoOYePKmNPLbWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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