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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27ecc66b9bce0743dda32888571278c5cf5c6b37ad31ff26afe1e5b2a0b4ad6b' 
  AND token = 's4cg5qfY1ny+VTWGm5E0BT0wo5haDpmGJOs0VGYBdSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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