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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c64cffa7dabb418dead35c4d8c6f9ed57ae927bfc530ba8c578fa911c3be51c' 
  AND token = 'b+qmvlLJIYSr9BvK/UdcS7vA2s6xDuQ0gANoaa+EeeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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