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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59669b1a8068e0ade373d04b299a82312d05ded577abde81d82ba4cb15ae1522' 
  AND token = '3WJqH1lEHxU/RYIn/lS6Gvwf5aGlcs2c9U4fdq+GQ0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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