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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2107e3da1ccb467abcc408fae44bac5b40bd5c0678213d2949031e69c55d3d9b' 
  AND token = '+Jl2reFGOtjb3RiYDALMjflQgZ/0tzSxmYv0Wf7o0Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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