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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b541073dc094395ff7f820c20129101a5c1551aa8801948fc47bdb5bfb09d5' 
  AND token = '8jCyChDpoEoRAs+dSCDh53pcdPlFLAUw+2fN2R6zgEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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