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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a63f6b86c1f7cf4d3ad56dc818150698249868365cdf4dec70c766596589d5' 
  AND token = 'mC/5flG25k9+VsR6T/hbvPwiNQ0CbnA0LjMWmoN4vu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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