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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca3618a8e035ffced44f8e3192c17e0fac0d5ca1379ad2ee279f7cb5a62d438e' 
  AND token = '7Rpq7ezqIPdkFySk9mj+hxFSzf9hl9VofwqziMgtz9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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