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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d32a85a2b3887ec03aa365b5ff4fe9f2f2e0796355cdeb88890fae4f31fecbf' 
  AND token = 'nc4IfJ8jsMSHPnnT4t2VsYi9EGwhKnmaMvb60yE26Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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