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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f87fb93507d52620d06f6fbb9cb1a3fe74802cec5a67cde4d13a1df5db19a82' 
  AND token = '125uI764wSvPP3SVpfQe7ynbKHQzGxJ8DtFJx3T3cCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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