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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba5c59b72cf1ea851c0210a005fc32437581af851b95c3b202f14f936e1ab7b3' 
  AND token = 'NLX3ODAkU1XkzHi6xcMo3P2njlNdrNV82GDJSthXlXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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