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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbfe3381c634f233e2063d04d8e0b2918c97b784f605317d297e4fd9c18f8d4' 
  AND token = 'AMZW+s6ENiuXnaBpZww23QJED1u9hflEON4cvwsmyn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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