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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c40647511a081503bb49b99178e38bfedba93308e10b6da0393337837a169e' 
  AND token = 'r/1Nf/cLyy3v645rlWgRHZGlSD3Jn+6CSKEdwJDxfeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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