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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe5c4c673a8659ea784b0bfe8983fee0e691a8838ff926eb54c109a1237d2e8' 
  AND token = 'Rj3Pm34SS0Sv09C5kasQI3FlCS+fmPoxcrYZsz83g2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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