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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1166faa1c3afc7643e2ac65d13760dc1446bfe3562144976bed3de4ed7d63f' 
  AND token = 'aAN+qsF5z09wYL53O6qViUl0ZURmkvitYU4i5p7DUqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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