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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e022b9e696f9d01f4a28615123cb575ba3100e3738fb94a874ad5d95f1328a' 
  AND token = 'lXoqviKrbq+0aPgntR4wBob7tdjFaTTz71KwToj0Jl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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