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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a364f3dae847af17b07d8770b6bd77bc1079c048c497f5b3dc0af17f0c6681e1' 
  AND token = 'zi4B2qOcqGyJ+p38TpmPC3f4NBTkwvnVi3kK6As4Hws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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