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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bd0e4620af43df708d5f47f07b8374e4911d703182619a060ee7aa12abfded' 
  AND token = '5dlsrgO9mn33OhK10mCdUdfzcl5QHRLAGLwzUJc2YKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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