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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0176157103aecac914c126c94033c39197f0238d923aa570172e2f8b1b14da75' 
  AND token = '1ybTUFCG51dl5QYzZiWkMkZHPpAla6X5Gf298Bika9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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