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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1369427cd12cd4f06d57bf71f82a1fc7f78f443f492993f59856e8748b3d83f3' 
  AND token = 'g8X1YXiOzcPB2n42OfHI747fzdLyLPT9heEqNNObe4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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