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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30d4639cf3743d949ac1a657c5b59316785e7979850cfeb9d4b6801a99b287aa' 
  AND token = 'hTIJ1pAnsH1D5KhP4DGY00DMc4zYvphNBdAxlD2Y/Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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