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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b6944c9b55370c2862feccf130313b89bdb6b586a91384232ea09224df66ba' 
  AND token = 'm7fg49aLttx5wYSwmDpxbbehDvf455tXf2fpSa89tow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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