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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce1d043a536fe772f963f15a2a25a64e29be7a29e6eb9a35794fa29d0cfa293' 
  AND token = 'B/cgjceqa6TLqR61Lc/kK1rVAa9MksR3x6oIK935Vck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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