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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c2ca14c6201f8adc70d14a91d5e4844f97c175ace6fc71c52aa23140ba0e12' 
  AND token = '4tXyxXKpEpMU0x0FhoICIvUoj/0qQAh8mecTa6LpJ9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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