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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5a8ff37d0a113804e9d4ef7a22b3b1656070d9338d44f6e45d89206d195a3cc' 
  AND token = '7iD9HVy1D5WtoMGcDOP7xhHD0uLbeAB3V4O2JCCu51E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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