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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fee3523a258cbe9443b084676daa218b35351a5004fdf8c7377460e02d7d52c' 
  AND token = '76GwTeFhXn3l7DjdDRj+NRRhxjZr82O9u3ofXUZW2VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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