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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ac8b0feb1d143444f90d263074e2317d02d44cfa3e15681e69dfaf44359a94' 
  AND token = 'h6h82OnT9piYFKqIr4Ya/N4u4gMZMMy7ung/PB6JQvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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