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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585fea549007ba2dee83190d1d4988375b9b980b001291891c6d093f5506fbc2' 
  AND token = 'KJdKY+lc+4BPODrma5gXay/Iz6e5h7KM0M4Tx875bAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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