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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237680eaf0841328b562ac337221ffd3f1eb6a1602629eefb34ec9f31fdb54d3' 
  AND token = '3Zdheb4Md2BjjDFnfV3SER4WyCyRZBJjtN/eufTLNmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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