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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d5c61743bfbfb014199eea7582ab90bcbe2c1c9e137a6c9070c7ab084ff3ad' 
  AND token = 'iEElQNS0szK3ojgVoneMMq6g4R+8btpE3BokbcHpOcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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