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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff638092e45990d3f1d6951cc4fd03c38101381428b2be383b5491220ffdbff' 
  AND token = 'XH+8lNm6ldp3AmoaL2RhkuNA6cxtN1xEEn9a0p8FzqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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