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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8399102c6b5fd8fe2082fa1f189f2c96a19b11dca0c88399a67f487b222237' 
  AND token = 'ckOFOwpSGFgrE2Z6VzQk8crLKk4ktb60VpEeC7IfNiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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