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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a86bf96a648507ea4a975c0e7dac539f772c8e798a75196bca80fd83c74227c' 
  AND token = '4uzXP7jB6NJCmErCniDDTLVXxUmndIKnvmHAYtI3Li0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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