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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0160acca974fd30cb908b21ca9eec048d769628dd076b321a6ad92f67f4ecec7' 
  AND token = 'keOM+LvT+MRhw1ssxZXXNiW7iKl/6JWcM9QgvmeETYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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