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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b84ed27f9116a022e15ebbefd7a2296c9d326d05e3609c83cc3ccd03dc1786a' 
  AND token = 'f5I1n5VMs13picXhhIIX5pNEYL3DKQcKIBJbZXxhHXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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