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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4520faf798f70a38dad73f8eb1a89525a2da218c6bbabe7dc8619c1994e4bee5' 
  AND token = '2QY8gohkh8cmiHF04gJ0C0zHl1s+HdJ6mWsnHbo5myM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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