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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6da82703c89fce24240e06a1a9597417874271908edacff239587828c8eacc' 
  AND token = 'YEObMtzVJdcZWfbi2eNaMp7su9ji5nK5qRFIpt+2Xn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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