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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70cabcaf9e61e2b57ed89dd1b11dd9f078dbe59c11198059429e6513775dcfe1' 
  AND token = 'g7xycB2OGjLl1JUMlcT4AlslMHK3YwYGzbbxagvhrGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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