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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb7e35a32c2853c8b19d5494b788ceada17b7d9f8c2657b69d4fc6cdef840cc' 
  AND token = 'toljbY56z9bxbRA4b0N/0jgUK4z/mnhvhSEzt/dNMpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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