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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be5953730f0a8870ee8ac02ae931450a131c41cae35a1e75a1eeca850c72951f' 
  AND token = 'm/LGZSLZe7zUvPwd383twRgRt9JOuAL0/O26QH0Pt1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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