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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7d66b0a7aab923107d60fee3aa4e587b8ddedf745d21ca14af60eb6b53fbc93' 
  AND token = 'XHnTb1QgnwiGsEOj7kOiwZI86urY/07jW3LL+cq8HiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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