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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd043564d680dca04c3035d6981a37381c8284fe1e9924fd97aa83ef5c0a1c5db' 
  AND token = 'ToAib9udb26iTaGHZsGQoA/TybWnlpDw4I1/kVV9tKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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