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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2498a2b3baef1c1f443b69f287edc484baaafbfb050ccfb98b80c0b8272f77c' 
  AND token = 'm+aTowQ5ol3ZQ7NyicEGwFyahGLBL9qkgfRUa74dtA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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