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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9d671e5f9e6d3239c27bfee0449bc63f99784918b8f6b2bb6b0c992cfff15a' 
  AND token = 'TEQQEBTnFp9irmGb+l3dZpzEXsj0/bb9Zmnb+Tq9QnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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