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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd43d8a8abb277d8b83a01b1188356bbcb817cc713dd0d14010d992fe9cf8cae6' 
  AND token = 'NBho+WuVUEMipURIqR07or5OTJu2Ag0l6WNoS89RUWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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