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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ece5f63a70c5ee0e2e7e74db8759e839b5453ee7b05ba5da21de60dde25d2e' 
  AND token = 'DhA1/o3oVSAK77neYXpPuMBX5wIX4NBwM6ey7BhIowk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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