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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea65582fc06e5bd9bb151343b4a47c344c9a29d2e59999d4be11d937d87b5e4' 
  AND token = 'FcAZPUcCCRCQrJBBadvbD9CAc4iduvreaBXkcj54GX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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