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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac2563d2d3f8e333052fdc2570f62b55098283eddbc1a54a7c0486db0097370' 
  AND token = 'QqviMoU9EHHCvCeQp/KpT/bIA81huTpcHiT4Ke86nv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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