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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c01dae6fef94fa212ba2fe3ec2c0a96a83c16584c9ecb60382acc16a7c97453d' 
  AND token = 'Ox+o7HnY6c63KhTgnfucLp3R75gL5IeYDslVdEZPhxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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