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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e1a11fc71fbc2b8464369df07774660b2d11da904b12905d89db365c9182102' 
  AND token = '6NePeTS+UZM2iJcSeWkkmpaE0Zq73LH7XKDQF/9XFX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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