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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a932b2d5762ea75a3d5f14a6dd6d5efe2b311f63be5a99d932ae3319e0a415' 
  AND token = '1MXp8wB2szpHs3+D4SP3T/NuSub274utcfJWf6AKmN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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