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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fab09c868c659a12250c6f4da03a5f244217f4a254987f83c2316c32243c3299' 
  AND token = 'G1pv66E+pB+w8yO4sRHia8Iyj/gKadQCpcew7Ey90Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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