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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740ccaacc66c3bdf67732c3f9e8af391c68499bf9f2c77d806bf58220b73c81d' 
  AND token = 'CmF72dVKmG2HU/v8iaH2pLdH3DnVgKoPQcHo09vGvbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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