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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8a7f4c91023040771627e674cad2d817f41f6e7723203f2bb36d0dec11cf596' 
  AND token = 'vVBSDLB9Acigkhg2hU7FNu6q4R9rsqf9sf06L2hP+nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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