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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31fd8a14076c13012bc21df01b3bc6ca5d1d4ec65d702ec48e4afa6b966cf9a' 
  AND token = '0kMjyOKxni181nB3W71QLfOwCVNd7znDJ39TQ9xpQSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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