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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4c3af731dc8773643ccfaf65cc260a7734155a2b1f5f9136eddceefa4c7f0cc' 
  AND token = 'fEk1F69ART+Ffhn+ANEOzy06V4hDErICqvEzGkUu4LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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